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[高中] 高三函數一題

[ Math ]3 留言, 推噓總分: +1

作者: emi921223 - 發表於 2018/03/22 20:35(6年前)

3^F推walkwall: log以2的立方根為底的函數03/22 23:20

[中學] 空間幾何

[ Math ]11 留言, 推噓總分: +3

作者: hero010188 - 發表於 2018/03/21 21:22(6年前)

1^F推walkwall: 別被八面體嚇到, 只是說AC與PQ共中點且互相垂直等長03/21 21:52

2^F→walkwall: 所以A點就是在 2x+3y+6z=0平面上距離圓點7的點03/21 21:53

3^F→walkwall: 由內積可算出(2,3,6)與(0,0,1)夾角cos值為 6/703/21 21:54

6^F推walkwall: sin值為根號13/7, 故最大z值為長度7在z軸正投影03/21 22:01

7^F→walkwall: 所以答案是根號1303/21 22:01

8^F→walkwall: 就正投影阿XD A換圓上不同點只是投影長不同03/21 22:03

9^F→walkwall: 所以直接考慮夾角算最長的就好了03/21 22:03

10^F→walkwall: 唔...有點懶得另外打一篇03/21 22:04

[已解決] 反證法請教：假定有最大正整數

[ Math ]36 留言, 推噓總分: +4

作者: pentiumevo - 發表於 2018/03/11 21:34(6年前)

1^F推walkwall: 反證法的話我會假定存在最大整數n>1 然後證明這03/11 22:26

2^F→walkwall: 樣會導致一個比n更大的正整數m 導致矛盾03/11 22:26

3^F→walkwall: 這樣假定不成立的話最大正整數就只能為1了03/11 22:27

4^F→walkwall: 手上沒書不清楚前後命題為何不過這這樣說來推導03/11 22:28

5^F→walkwall: 大概不會是用加而是乘例如若n成立則n^2成立03/11 22:29

6^F→walkwall: 才可能有上面的結果03/11 22:29

15^F推walkwall: 剛剛看了你的書本網頁版, 我覺得上述n^2替換掉n+103/11 23:32

19^F→walkwall: 應該就是你所想要的證明03/11 23:32

20^F→walkwall: 他只是要你練習寫出能做出這樣證明的關鍵步驟03/11 23:33

21^F→walkwall: 而非後續證明的預備定理03/11 23:34

33^F推walkwall: 噗居然有名字的阿... 我真的不知道只是照著數03/12 06:53

34^F→walkwall: 學的直覺應該要這樣寫而已03/12 06:54

[中學] 一題高一機率

[ Math ]8 留言, 推噓總分: +3

作者: wizkhalifa23 - 發表於 2017/09/13 18:35(6年前)

6^F→walkwall: XDDD 數學名詞不精準還當數學老師真是辛苦學生了09/13 22:42

Re: [微積] 函數遞減的證明 (懸賞批幣或現金)

[ Math ]5 留言, 推噓總分: +3

作者: willydp - 發表於 2017/08/18 19:34(6年前)

4^F推walkwall: XD 這酬勞真不好賺08/19 21:51

[中學] 一題數學（代po)

[ Math ]5 留言, 推噓總分: +1

作者: wizkhalifa23 - 發表於 2017/08/05 20:59(6年前)

2^F→walkwall: 0.4X-2 為反例若題目是整係數多項式則 1選項對08/05 21:02

3^F→walkwall: -.- 上面那題問完就刪了 ....08/05 23:58

4^F→walkwall: 也罷以後他的問題就不要回好了08/06 00:08

5^F推walkwall: 不客氣 ^^08/06 12:54

[線代] 找Eigenvector

[ Math ]7 留言, 推噓總分: +4

作者: gamlty99 - 發表於 2017/07/22 14:46(7年前)

2^F推walkwall: 阿就 X2,X3 均為0時, X1 可為任意值, 取單位向量07/22 15:14

3^F→walkwall: 重根的都會變成這樣的啦~07/22 15:15

6^F推walkwall: 嗯嗯清楚明白標示了解空間的兩個基底07/22 18:40

[工數］Gram-Schmidt正交化推導

[ Math ]4 留言, 推噓總分: +1

作者: uni1021 - 發表於 2017/07/21 18:24(7年前)

3^F推walkwall: 所以倒數第二行分母的根號到哪去了07/21 21:07

4^F→walkwall: 不然就沒錯阿 wiki上面的 mu 都是單位向量07/21 21:08

Re: [中學] 國二奧林匹克試題

[ Math ]1 留言, 推噓總分: +1

作者: dullstupid - 發表於 2017/07/20 00:09(7年前)

1^F推walkwall: 嗯這個好簡潔多了07/20 01:29

[中學] 國二奧林匹克試題

[ Math ]6 留言, 推噓總分: +3

作者: tcbt32 - 發表於 2017/07/19 21:23(7年前)

1^F推walkwall: 5. 就直角座標系點帶進去算P就好啦07/19 22:37

3^F推walkwall: 11. 設BE=x, DF=y, 則AE, AF都可由x,y 表達07/19 22:50

4^F→walkwall: 由下列兩關係聯立解xy : AEF餘式定理 ECF畢氏定理07/19 22:51

5^F→walkwall: 其他都有人回答惹~07/19 22:52

6^F→walkwall: 喔...抱歉打錯是AEF餘弦定理07/19 22:56

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